Yes its scam. The dev team selling to invoice buyers their own token for price 1 euro / each token.
Invoice buyers need have 1% payed in HVN token which need buy from dev team for price 1 euro/each.
But the team have 90 000 000 tokens so people invest in ico or token holders never be allow to sell tokens for 1 euro on platform because 90 mill tokens (=euros) as 1% that mean they (Team) need sell  invoices worth more than
9 000 000 000 euros to start take tokens from exchanges but on exchanges price is 11 satoshi so even after 5 years they can still buy another 90 mill tokens for 0.001$ /each token and sell again on their platform for 1 euro /each token. So people holding HVN are rekt.